feature: checker

src/base/single/input/input.js

@@ -207,13 +207,24 @@ BI.Input = BI.inherit(BI.Single, {
     },
 
     _checkValidationOnValueChange: function () {
-        var o = this.options;
+        var self = this, o = this.options;
         var v = this.getValue();
-        this.setValid(
-            (o.allowBlank === true && BI.trim(v) == "") || (
-                BI.isNotEmptyString(BI.trim(v)) && o.validationChecker.apply(this, [BI.trim(v)]) !== false
-            )
-        );
+        if (o.allowBlank === true && BI.trim(v) == "") {
+            this.setValid(true);
+            return;
+        }
+        if (BI.trim(v) == "") {
+            this.setValid(false);
+            return;
+        }
+        var checker = o.validationChecker.apply(this, [BI.trim(v)]);
+        if (checker instanceof Promise) {
+            checker.then(function (validate) {
+                self.setValid(validate !== false);
+            })
+        } else {
+            this.setValid(checker !== false);
+        }
     },
 
     focus: function () {